Wow wow wow jiofi is the very good device . the reliance jio comes with a free jio sim . however you need to go through the full documentation the process of getting the sim . the device has a 2300 mAh battery . in the box you have a charge and usb cable . most of us will primarily buy a jiofi device to tap into the high speed internet, at least initially . so speed is the crucial thing hear . I tested the jiofi primarily on a android smartphone, apple iPhone 6s plus and MacBook air . on a all speed test numbers were really good, clocking over 30 mbps download speed an most location . jiofi has very good connection reliability and its service and support is also very good . I use this device from last 6 month and I’m very happy with this. thanku